Temperature-sensitive platinum catalyst and preparation method thereof

A platinum catalyst, temperature-sensitive technology, used in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc. Short life and other problems, to achieve the effect of long storage stability, excellent storage stability and long service life

Active Publication Date: 2010-06-02
ZHUZHOU TIMES ELECTRIC INSULATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For some addition-type silicone resins and silicone rubber products cured at medium and high temperatures, due to their high viscosity, they often need to be heated to a higher temperature before they can be used. Long-term use at higher temperatures leads to a significantly shorter service life of the product
However, the silicone resin or silicone rubber products formulated with the above-mentioned catalysts have a short service life and must be used up in a short period of time, otherwise they will gel and cannot be used. Although platinum inhibitors (such as 1-ethynyl cyclohexanol, 2-methyl-3-butyn-2-ol and 3,5-dimethyl-1-hexyn-3-ol) can significantly prolong the service life of the product, but the effect is not exact because these compounds are difficult to purify , and the complex of platinum inhibitor and platinum is a dark compound, the addition of platinum inhibitor will significantly increase the color of the product

Method used

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  • Temperature-sensitive platinum catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] First, 10g of nano-titanium oxide with an average particle diameter of 40nm (its specific surface area is 100m 2 / g) is dispersed in 100g of ethanol under stirring, then 10g of platinum complexes with a platinum content of 5% are added, stirred at 60-70°C for 2h, lowered to room temperature and continued to stir for 24h, after the stirring is completed, at 60-70°C ℃ and vacuum, and then heat-treated at 150℃ for 12 hours to obtain a platinum catalyst carrier; disperse 10g of platinum catalyst carrier into 500g of pure water under stirring, and then add 90g of For polymethylphenylsiloxane, heat up to 90-100°C. After the polymethylphenylsiloxane is completely melted, continue to keep warm and stir for 30 minutes, and then cool to room temperature under stirring. At this time, the temperature-sensitive resin is released from the solution Precipitated, wrapped on the surface of the platinum catalyst carrier, separated by a centrifuge, washed the temperature-sensitive platinu...

example 2

[0028] Prepare the platinum catalyst carrier according to Example 1. The temperature-sensitive resin is precipitated from the solution. After washing with warm water and centrifuging with a centrifuge, add 2000g of methylphenylvinyl silicone oil, and then evacuate under vacuum at 50°C for 4.5h to obtain the Temperature-sensitive platinum catalyst colloid wrapped in epoxy resin with a platinum content of about 200ppm.

example 3

[0030] First, 5g of nano-silicon oxide with an average particle diameter of 10nm (its specific surface area is 400m 2 / g) is dispersed in 100g of acetone under stirring, then add 5g of platinum complex with a platinum content of 5%, stir at 50-60°C for 4h, drop to room temperature and continue stirring for 24h, after the stirring is completed, at 50-70 ℃ and under vacuum to remove the solvent, heat treatment at 120 ℃ for 12h after removing the solvent, to obtain a platinum catalyst carrier;

[0031] Disperse 5g of platinum catalyst carrier into 500g of pure water under stirring, then add 90g of polyacrylamide resin with a softening point of 80-90°C, raise the temperature to 90-100°C, and continue to keep warm and stir after the polyacrylamide resin is completely melted 30min, and then rapidly cooled to room temperature under stirring, at this time, the temperature-sensitive resin was precipitated from the solution, wrapped on the surface of the platinum catalyst carrier, separ...

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Abstract

The invention discloses a temperature-sensitive platinum catalyst and a preparation method thereof. For preparing the temperature-sensitive platinum catalyst, a nanophase material with large specific surface is used as a carrier; the adsorption of the nanophase material is utilized to adsorb a platinum complex on the surface of the nanophase material; the platinum complex is made stable through the heat treatment, then a layer of temperature-sensitive resin is coated on the surface of the platinum complex, and a temperature-sensitive platinum catalyst powder is obtained through the dry treatment or a temperature-sensitive platinum catalyst colloid is obtained by dispersing the temperature-sensitive platinum catalyst powder into a liquid phase system. The temperature-sensitive platinum catalyst has the following obvious characteristics that the catalyst is very stable under the softening point temperature of the temperature-sensitive resin and hardly has catalysis effect, but immediately has high catalytic activity above the softening point temperature so as to achieve the purpose of fast curing. The temperature-sensitive platinum catalyst is suitable for the curing system of addition-type silicon rubber and silicone at medium and high temperature.

Description

technical field [0001] The invention relates to a platinum catalyst and a preparation method thereof, in particular to a temperature-sensitive platinum catalyst used in addition-type silicone rubber and silicone resin cured at medium and high temperatures. Background technique [0002] The addition of Si-H functional compounds (hydrosilylation) to compounds with aliphatic unsaturation, especially C=C double bonds, has long allowed the preparation of silicon-containing organic compounds, organosilanes, and organic compounds by hydrosilylation. silicone. It is especially useful for addition-crosslinking curing of organopolysiloxanes in the silicone industry, for example for the production of elastomers, release coatings, insulating impregnating resins or pressure-sensitive adhesive tapes. The catalysts used for the hydrosilane reaction are mostly platinum and its compounds, wherein the platinum is used either in metallic form, such as platinum salts, or in the form of dissolv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42
Inventor 周光红姜其斌李鸿岩李钦黎勇
Owner ZHUZHOU TIMES ELECTRIC INSULATION
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